Bracelet clasp with length-adjustment device

1. Wristlet clasp provided with a cover and designed to assemble a first and a second end of a wristlet to open or increase the wristlet, with the clasp comprising a wheel whose longitudinal position is fixed relative to the cover, where the rotation of the wheel allows the wristlet length to be adjusted,

characterized by:

a threaded rod parallel to the plane of the wristlet, with the threaded rod being connected to a first end of the wristlet,

the rotation of the wheel causing a screwing respectively unscrewing of the threaded rod so as to move said first end relative to the cover, the cover covering said threaded rod, and said threaded rod being connected to a wristlet link sliding under said cover.

2. The clasp of claim 1 , wherein said wheel comprises a bored hole, said threaded rod being engaged in said bored hole so that the rotation of the wheel causes the screwing respectively unscrewing of said rod in said wheel.

3. The clasp of claim 1 , wherein said threaded rod is fixedly united with said wheel,

with said rod being engaged in a bored hole of said first end,

so that the rotation of the wheel with the threaded rod causes the screwing respectively unscrewing of said threaded rod in said bored hole.

4. The clasp of claim 1 , wherein said threaded rod ( 20 ) is parallel to the wristlet's longitudinal axis.

5. The clasp of claim 1 , with said wheel being capable of being actuated when the cover is closed.

6. The clasp of claim 5 , with said cover having an opening allowing access to a portion of the outer surface of the wheel to adjust the wristlet length.

7. The clasp of claim 1 , where said wheel is held against the inner side of said cover with the aid of at least one bow traversed by said rod.

8. The clasp of claim 1 , having unfolding blades that close under said cover in closed position and unfold outside the cover in open position.

9. The clasp of claim 8 , said unfolding blades having a central bit closing between the two lateral bits of a chassis, said central bit taking up a single width with said chassis in closed position.

10. The clasp of claim 8 , with said threaded rod being hidden in a space between said cover and said unfolding blades when the cover is closed.

11. The clasp of claim 8 , having at least one push-button for releasing said unfolding blades and allowing the clasp to open.

12. The clasp of claim 1 , where said link is guided between the upper side of the cover and guiding portions of the cover under said link.

13. The clasp of claim 12 , with said cover being formed by folding and die stamping from a sheet of uniform thickness.

14. The clasp of claim 1 , where the greatest part of said wheel is accommodated under the cover.

15. Wristlet clasp provided with a cover and designed to assemble a first and a second end of a wristlet to open or increase the wristlet, with the clasp comprising a wheel whose longitudinal position is fixed relative to the cover, where the rotation of the wheel allows the wristlet length to be adjusted,

characterized by:

a threaded rod parallel to the plane of the wristlet, with the threaded rod being connected to a first end of the wristlet,

the rotation of the wheel causing a screwing respectively unscrewing of the threaded rod so as to move said first end relative to the cover, the cover covering said threaded rod, and the clasp having unfolding blades that close under said cover in closed position and unfold outside the cover in open position.

16. The clasp of claim 15 , said unfolding blades having a central bit closing between the two lateral bits of a chassis, said central bit taking up a single width with said chassis in closed position.

17. The clasp of claim 15 , with said threaded rod being hidden in a space between said cover and said unfolding blades when the cover is closed.

18. The clasp of claim 15 , having at least one push-button for releasing said unfolding blades and allowing the clasp to open.